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ATC Associates Inc. <br /> V1117�� Lone Palm Avenue,Suite B <br /> Modesto,California 95351 <br /> 209-579-2221 <br /> Fax:209-579-2225 <br /> A S S O C I A T E S I N C . <br /> ok 4- r. p,...J s l`� "� M� 7-41 9,4, 98 9C <br /> June 8, 2012 ��fZ <br /> 54.26823.0001 z M41R/ 10 A <br /> Ms.Lisa Medina <br /> San Joaquin County <br /> Environmental Health Department <br /> 1868 East Hazelton Avenue <br /> Stockton, California 95205 <br /> Subject: Status Report—First Quarter 2012,Jamar Service Station, 4075 East Main Street, <br /> Stockton,California <br /> Dear Ms. Medina: <br /> ATC Associates Inc. (ATC)has prepared this report to summarize corrective action activities conducted <br /> at the site located at 4075 East Main Street in Stockton, California (Figure 1). This report presents <br /> information pertaining to remediation activities conducted during the first quarter of 2012. <br /> Due to limited funding available from:the UST Cleanup Fund, ATC requested that groundwater <br /> monitoring be temporarily suspended so the available funds could be applied toward active site <br /> remediation. This request was approved by the San Joaquin County Environmental Health Department <br /> (SJEHD) via email dated November 8, 2011. Groundwater monitoring and sampling was not conducted <br /> during this period. <br /> BACKGROUND <br /> In 1995, one 500-gallon waste oil underground storage tank (UST) and one 500-gallon kerosene UST <br /> were removed from the site. <br /> In December 1998,two 6,000-gallon and one 10,000-gallon gasoline USTs were removed from the site. <br /> Soil samples were collected from the tank pit and analyzed for petroleum hydrocarbon compounds. Lab <br /> analyses indicated the samples collected from the tank excavation contained detectable concentrations of <br /> petroleum hydrocarbon constituents. The excavation was subsequently backfilled and a 20,000-gallon <br /> UST was installed. <br /> In September 1999, John P. Cummings&Associates (JPCA)advanced three soil borings(MW 1, MW2, <br /> and MW3)to depths ranging from approximately 74 to 78 feet below ground surface(bgs). The borings <br /> were completed as groundwater monitoring wells. <br /> In August 2000, JPCA advanced three soil borings (B 1, MW4, and MW5), and MW4 and MW5 were <br /> completed as groundwater monitoring wells. Boring B1 was advanced to a depth of 115 feet bgs and <br /> wells MW4 and MW5 were installed to a depth of 75 feet bgs. Soil and groundwater samples were <br /> Jamar Status Rpt 1 Q 2012 1 <br />